Experienced users

If you’ve used previous versions of H2O-3, the following links will help guide you through the process of upgrading H2O-3.

Changes

Change log

This page houses the most recent changes in the latest build of H2O-3. It lists new features, improvements, security updates, documentation improvements, and bug fixes for each release.

Developers

If you’re looking to use H2O-3 to help you develop your own apps, the following links will provide helpful references.

Gradle

H2O-3’s build is completely managed by Gradle. Any IDEA with Gradle support is sufficient for H2O-3 development. The latest versions of IntelliJ IDEA are thoroughly tested and proven to work well.

Open the folder with H2O-3 in IntelliJ IDEA and it will automatically recognize that Gradle is requried and will import the project. The Gradle wrapper present in the repository itself may be used manually/directly to build and test if required.

For JUnit tests to pass, you may need multiple H2O-3 nodes. Create a “Run/Debug” configuration:

Type: Application
Main class: H2OApp
Use class path of module: h2o-app

After starting multiple “worker” node processes in addition to the JUnit test process, they will cloud up and run the multi-node JUnit tests.

Maven install

You can view instructions for using H2O-3 with Maven on the Downloads page.

  1. Select H2O Open Source Platform or scroll down to H2O.

  2. Select the version of H2O-3 you want to install (latest stable or nightly build).

  3. Click the Use from Maven tab.

This page provides information on how to build a version of H2O-3 that generates the correct IDE files for your Maven installation.

Developer resources

Documentation

See the detailed instructions on how to build and launch H2O-3, including how to clone the repository, how to pull from the repository, and how to install required dependencies.

Droplet project templates

This page provides template information for projects created in Java, Scala, or Sparkling Water.

Blogs

Learn more about performance characteristics when implementing new algorithms in this KV Store guide blog.

This blog post by Cliff walks you through building a new algorithm, using K-Means, Quantiles, and Grep as examples.

Join the H2O community

Join our community support and outreach by accessing self-paced courses, scoping out meetups, and interacting with other users and our team.

Contributing code

If you’re interested in contributing code to H2O-3, we appreciate your assistance! See how to contribute to H2O-3. This document describes how to access our list of issues, or suggested tasks for contributors, and how to contact us.